Bought a '92 300D in Sept. with 98,000 miles on it. Love it! Guy we bought it from stored it in winters and never hooked up the block heater. It is now January in the upper mid-west and of course cold. Car is garage kept and so far we haven't had any issues with it starting even w/o block heater. Questions: Is it imparative to connect heater block? Are we possibly causing any engine damage by not plugging it in at night? Car has been running awesome and we make sure it's good and warmed up before we drive. Any other diesel engine winter care tips would be appreciated.